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I reckon starting from scratch is a billionty times easier & quicker than splicing in parts of looms together; the only thing is not to run out of patience (like I repeatedly did), and to use the correct colour wires ... I've got too many places in my car where I ran out of light green with a white stripe & the last few metres are red with a light green stripe.

its a massive head fuck.. but worth it in the end.. i got rid of SO much shit.. and it was a good learnign curve.. and atleast this way when somethign goes wrong u knowwhere to loook, unlike th efactory wiring loom when u would need 15 differnt diagrams to work it out.

some cars the body harness and engine harness are seperate, now most of it is all intergrated together, making more of a pita to work on.

you either need to wire it right in the first place, or strip it and create a new engine harness with it's own power relays etc.

nissans are reasonbly good, toyota's are a royal cunt, but i hate their engine managment in general, way over complicated, circuit opening relays, voltage sense wires, all bullshit, not needed to begin with, they should have simplified save cost on wiring and weight.

i went nuts on my poopra wiring but i didnt have to worry about keeping anything operational other than lights/dash.
engine stuff has its own seperate loom.

This is pretty much my understanding and much the same as what I plan to do.

Air con is already disabled, will completely remove it, the heater core and all the associated fans/ductin if/when the dash gets stripped. Might annoy me not having a fan but I can always rig some simple little setup with a toggle switch if neccessary.

best advice i can give you is to totally remove the loom from the car , every last bit and lay it out , 10x as easy as working in the car.
even doing it this way took me a solid week of working out what to remove and what to leave.
i would have less than 5% of the original wiring left now.

Ive just negociated myself a new garage to work in so looks like this will be good to go.

So what do you reckon, get a big sheet of ply or something I can nail into/write on, then pull the loom out and pin it up on the board?

Ive never been able to quite get my head around how you know how to make a loom on a board without getting all the wires the wrong length. I guess it would be easy enough if youre working on top of an existing loom though.

So did you swap all the old plugs over to the new loom or buy new ones? Old plugs suck to work with but new ones would be a major PITA to get hold of.